Shielded Cables

What are shielded cables as a subset of network cable?
Shielded cables - shielded cable or shield twisted pair (STP) cable has an outside layer or “shield” of conductive material around the internal conductors, which needs to be grounded to cancel the effect of electromagnetic interference (EMI).  Shielded cables vs Unshielded Ethernet Cable: Basic Information
A shielded cable or shield twisted pair (STP) cable has an outside layer or “shield” of conductive material around the internal conductors (Shielded cables), which needs to be grounded to cancel the effect of electromagnetic interference (EMI). The conductive shield can reflect or conduct external interference away without affecting the signals of the internal conductor. Therefore, shielded Ethernet cables are usually used to protect signals from EMI over the length of the cable run, so as to result in faster transmission speeds and fewer data errors in using shielded cables.